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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03d311d01ccaa6123e23291eb29934511ef53f8fe7c432c456896be85f7e3d1' 
  AND token = 'th50viN9Tu7T/6NxzhhY0DwkugKjCDhHzRLR/7v22oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}